EP0565346B1 - Phosphatierungsbehandlung für metallische Substrate - Google Patents

Phosphatierungsbehandlung für metallische Substrate Download PDF

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Publication number
EP0565346B1
EP0565346B1 EP93302702A EP93302702A EP0565346B1 EP 0565346 B1 EP0565346 B1 EP 0565346B1 EP 93302702 A EP93302702 A EP 93302702A EP 93302702 A EP93302702 A EP 93302702A EP 0565346 B1 EP0565346 B1 EP 0565346B1
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Prior art keywords
metal
silica
ions
composition
coating
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EP93302702A
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English (en)
French (fr)
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EP0565346A1 (de
Inventor
Gianfranco Liberti
Kevin Brown
Laurence Castle
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Chemetall Ltd
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Brent International PLC
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings

Definitions

  • This invention relates to conversion coating of metal substrates which may comprise steel, zinc or zinc based alloys or zinc aluminium alloy coated steel, aluminium or aluminium alloy surfaces to provide a corrosion resistant surface which can subsequently be coated with a paint coating.
  • the invention relates to a dry-in-place metal coating process which is free of environmentally undesirable chromium and which will provide good results on the metal surfaces described above.
  • the conventional treatment of metals uses chromium based solution either for producing a conversion coating or for a final passivation rinse.
  • a typical treatment sequence comprises cleaning (optionally with mechanical cleaning means or electro cleaning); rinsing; application of a chromate chemical composition or a phosphate coating composition comprising other metal ions in a conversion coating stage; rinsing, and; final passivation (chromium containing) or rinsing, which is followed by oven drying and paint application.
  • the conversion coating solution is applied either by spray or immersion and subsequent rinsing steps are required.
  • the process speed becomes particularly important in on-line processes for example in coil-coating processes, where a continuous strip of sheet metal is uncoiled at the line entrance and recoiled at the exit, having been painted or otherwise treated.
  • Line speeds can be up to 200 m/min.
  • treatment times must be very short and a reduction in the number of process steps enables an desirable reduction of the line length.
  • any coating composition imbalance even if very promptly corrected could lead to huge losses and scrap, and therefore the coating compositions are preferably relatively simple and easily maintained.
  • EP-A-0478028 relates to providing crystalline zinc phosphate conversion coatings on metals.
  • An initial activation step is used which tends to adversely affect the subsequent phosphating step.
  • Silicate is therefore added to precipitate out any titanium ions which can then be removed from the phosphating composition.
  • the phosphated surface is rinsed prior to paint coating and so the process described is not a dry-in-place conversion coating method.
  • GB 2041987 relates to chromate free solutions used for coating surfaces of aluminium or aluminium alloy for dry-in-place processes.
  • the specification relates specifically to aluminium surfaces and the compositions do include transition metal additives which are oxy metal anions, also disadvantageous from an environmental point of view.
  • a phosphating composition which comprises an aqueous dispersion of silica and an acidic trivalent metal compound. Oxy metal anions are specifically excluded from the composition and preferably also there is no divalent metal present.
  • compositions comprising silica and phosphoric acid are known for treating metal surfaces but not as pre-treatment for permanent paint coatings.
  • FR-A-2272192 relates to treating surfaces so that they will support lubricants for cold forming of steel and JP-A-54130449 describes the formation of an insulating film on an electrical steel sheet for use in magnetic cores, transformers and electric motors.
  • the coating In order to provide an anti-corrosion coating on metal surfaces; which is suitable to be used as a base for subsequent paint coating, particular properties are required.
  • the coating must provide good anti-corrosion properties which must not be adversely affected by the subsequent paint coat.
  • the surface must be suitable to provide good adhesion for the paint coating.
  • the present invention aims to provide an effective dry-in-place chromium-free treatment.
  • the main components of the composition can be used across a range of steel, zinc or zinc alloys, aluminium or aluminium alloy metal substrates.
  • metal processing of each of these metal surfaces can be effected with a minimum of composition changes.
  • a method for coating a metal surface comprising in a first step contacting the metal surface with an aqueous composition comprising silica, phosphoric acid and a divalent metal ion selected from manganese. cobalt, iron, zinc and alkaline earth metals in a concentration of at least 0.001M, the composition being substantially free of chromium and of any oxy metal anions in which the metal has a valency of at least 5, and subsequently curing the coating metal substrate with no intermediate rinsing stage and in a second stage applying a second coating layer which is curable to form a fixed layer.
  • the aqueous composition is also substantially free of trivalent metal ions.
  • silica is less well known and has an entirely different effect in a metal coating composition.
  • the composition is cured. Curing is effected by drying, preferably be passing through an oven. Most preferably the metal should reach a PMT (peak metal temperature) of approximately 70 to 140°C preferably 80 to 120°C. This ensures the reaction is completed between the phosphating liquid remaining on the surface of the metal and the metal surface itself, resulting in a coating which provides an effective anti-corrosion surface for the subsequent application of a paint coating.
  • the silica from the composition forms part of the coating.
  • the expression "substantially free of” is intended to mean that none of these components have been added to the composition and the presence of any of these components is no more than by their incidental inclusion in any of the other components. Preferably they are present in amounts below 100ppm most preferably below 50ppm, most preferably below 30ppm.
  • compositions used in the process should be substantially free of chromium ions.
  • oxymetal anions in which the metal has a valency of 5 or more are specifically excluded from the compositions claimed. They are not only environmentally undesirable but in addition have been found to be detrimental to the corrosion resistance of the conversion coatings formed from the compositions used in the claimed coating process.
  • the quantities of the components in the composition can vary but are preferably chosen to suit the particular metal which is prevalent in the surface being treated and therefore depends upon whether the metal surface being treated is mainly steel, galvanised or aluminium (or aluminium/zinc alloy).
  • the silica content is generally at least 0.01, preferably at least 0.05, and most preferably at least 0.1 moles/litre Generally the silica content is no greater than 1.0, preferably no greater than 0.5, and most preferably no greater 0.2 moles/litre.
  • the total phosphate content in the composition is generally at least 0.02, preferably at least 0.05 and most preferably at least 0.1 moles/litre. Usually it is no greater than 0.5, preferably no greater than 0.2 and most preferably no greater than 0.1 moles/litre.
  • the free phosphoric acid content is preferably at least 0.02, preferably at least 0.03 and most preferably at least 0.05 moles/litre.
  • the amount of divalent metal ion in the composition is at least 0.001, preferably at least 0.01, and most preferably at least 0.025 moles/litre in the aqueous composition.
  • it will be no greater than 0.5, preferably no greater than 0.2 and most preferably no greater than 0.05 moles/litre (based on metal ion content).
  • the preferred molar ratios of the components range from 1:1 to 1:0.7 for silica:total phosphate ion; around 1:3 to 1:5 for metal ions:total phosphate ion; and 1:2.5 to 1:7 for the metal ions:silica.
  • the optimum composition will generally comprise from at least 0.01, preferably at least 0.05 and most preferably at least 0.1 moles/litre silica.
  • the aqueous composition will include no greater than 1.0, preferably no greater than 0.5 and most preferably no greater than 0.2 moles/litre.
  • the total phosphate ion content this is generally at least 0.02, preferably at least 0.1 and most preferably at least 0.2 moles/litre.
  • the total phosphate content in the aqueous composition will be no greater than 2.0, preferably no greater than 0.5 and most preferably no greater than 0.25 moles/litre.
  • the free phosphoric acid content is generally at least 0.02 preferably at least 0.03 and most preferably at least 0.04 moles/litre.
  • the free phosphoric acid content will be no greater than 0.5, preferably no greater than 0.2 and most preferably no greater than 0.1 moles/litre.
  • the metal ion content in the composition is at least 0.001, preferably at least 0.03 and most preferably at least 0.05 moles/litre. Generally it will be present in an amount no greater than 0.5, preferably no greater than 0.2 and most preferably no greater than 0.1 moles/litre.
  • the preferred molar ratio of silica:total phosphate ion is in the range of about 1:0.8 to 1:1.5; the preferred ratio of divalent metal ions:total phosphate ion is in the range 1:2.5 to 1:5 and the preferred ratio of divalent metal ions:silica is in the range of about 1:2.5 to 1:3.
  • the aqueous composition should also include an activator preferably fluoride ions.
  • fluoride ions will be provided in the form of hydrogen fluoride.
  • Fluoride may be present in amounts up to 0.5 moles/litre, preferably in amounts from 0.01 to 0.1 moles/litre and most preferably from 0.02 to 0.03 moles/litre.
  • the addition of hydrogen fluoride to the composition may also contribute to the free acidity in the solution. Since hydrogen fluoride has a tendency to react with silica to produce fluoro silicate, when the composition includes hydrogen fluoride the composition is preferably prepared and stored in a two-pack form in which the contents of the two packs are mixed shortly prior to use.
  • the silica will be present in one of the packs and the hydrogen fluoride will be kept separate in the second pack.
  • the first pack will comprise phosphoric acid, metal ion and hydrogen fluoride and the second pack will comprise silica.
  • both are in the form of an aqueous based composition.
  • the composition will generally contain at least 0.05, preferably at least 0.1 and most preferably at least 0.25 moles/litre silica, generally being no greater than 1.0, preferably no greater than 0.5 and most preferably a maximum of 0.35 moles/litre in the aqueous composition.
  • the amount of total phosphate ion will generally be at least 0.05, preferably at least 0.1 and most preferably at least 0.5 moles/litre. Generally no greater than 2.0, preferably no greater than 1.0 and most preferably no greater than 0.5 moles/litre of the aqueous composition.
  • the free phosphoric acid content is generally at least 0.05 and preferably at least 0.1 moles/litre, generally being no greater than 0.5, preferably no greater than 0.3 and most preferably no greater than 0.2 moles/litre.
  • the divalent metal ion is present in an amount of at least 0.001, preferably at least 0.05 and most preferably at least 0.1 moles/litre, generally no greater than 1.0, preferably no greater than 0.5 and most preferably no greater than 0.2 moles/litre of the aqueous composition.
  • the preferred molar ratios for silica:total phosphate ion is in the range of about 1:1 to 1:2; for divalent metal ions:phosphate ion is preferably in the range of about 1:2.5 to 1:5; and for divalent metal ions:silica the molar ratio is preferably in the range of about 1:1 to 1:3.
  • the divalent metal ion used in the composition is selected from Mn, Co, Fe, Ni, Zn and alkaline earth divalent metal ions such as Mg, Ca, Sr, or Ba.
  • the divalent metal ion is other than nickel for environmental reasons.
  • calcium, zinc or magnesium ions are used to provide the divalent metal ion, most preferably calcium. They are generally added to the aqueous composition in the form of a non-interfering oxide, hydroxide or salt such as a carbonate. They may however, be added in the form of a phosphate salt, when an additional source of acid, such as hydrogen fluoride is present in the composition, thereby contributing to the phosphoric acid content in the composition. Alternatively the metal itself may be added to acidic composition to dissolve.
  • the silica particles are high surface area particles which are dispersed in solution to form a homogeneous, that is colloidal, dispersion (which can be clear or hazy) or capable of becoming dispersed in solution.
  • the use of fume or precipitated silica is preferred, especially those commercially available in the form of relatively high solids content viscous dispersions and in the form of silica sold under the trade names Aerosil (trade mark of Degussa). Mixtures of different forms of silica may be used if desired.
  • the phosphoric acid is generally added to the aqueous composition in the form of an aqueous solution for example a 50% active or higher aqueous solution.
  • phosphate ions may be added, for example, as divalent metal phosphate, thereby contributing phosphoric acid to the composition.
  • the composition also includes boric acid.
  • boric acid is generally present in an amount of at least 0.02, and most preferably at least 0.075 moles/litre.
  • the boric acid will be in an amount no greater than 0.5, preferably no greater than 0.2 and most preferably no greater than 0.1 in the aqueous composition.
  • a slightly higher concentration of boric acid is preferred.
  • this will be at least 0.05 and most preferably at least 0.1 moles/litre.
  • the amount will be no greater than 0.7, preferably no greater 0.4 and most preferably no greater than 0.2 moles/litre.
  • aqueous compositions are prepared by the incorporation of the necessary ingredients into deionised water.
  • the order of addition may be in any convenient way but is generally by firstly preparing a concentrate of the composition.
  • the present invention also includes a concentrate for a solution for metal coating comprising silica, phosphoric acid and a divalent metal ion, the concentrate being substantially free of chromium, any oxy metal anions in which the metal has a valency of at least 5 and any trivalent metal ions.
  • the invention also includes a two-pack concentrate in which at least one of the components of the composition is in a first pack and at least one other component is in a second pack.
  • the invention comprises a two-pack concentrate in which the first pack comprises at least hydrogen fluoride and the second pack at least silica.
  • the concentrate should include each of these components in a concentration so that dilution with water will produce the required end-use composition including the specific amounts of each component, as described above.
  • the end-use composition will comprise dilutions of a one or two-pack concentrate.
  • compositions can be prepared by the addition of the components in any convenient order. It is generally convenient to mix the silica with at least a portion of the water prior to mixing with the remaining component of the composition. The remaining components can be added subsequently, optionally also dissolved in a portion of the water.
  • the invention is particularly aimed at providing a fast and efficient treatment for a coil coating metal conversion process.
  • the coating is generally applied by roll coating or reverse roll coating, or by passing the uncoiled metal sheet through a bath of the composition so that application is by immersion.
  • any other standard application form can be used such as by spraying or conventional spray/dip treatment.
  • contact is at ambient temperature.
  • the amount of teh composition may be controlled by passing the coated metal through Squeegee rolls optionally having an engraved surface.
  • the amount of composition remaining on the metal surfaces should preferably be sufficient to produce a coating weight of from 0.25-5g/m after curing.
  • the metal to be treated is generally first cleaned and rinsed in a conventional manner. No activation step is necessary and the cleaned metal is then contacted with the coating composition.
  • the curing step comprises drying the coating.
  • curing is by heating and this may be carried out by conventional means, for example by passing the coil or coated article through an oven or exposing to IR radiation.
  • the PMT reached on curing is from at least 60°C, preferably at least 70°C most preferably at least 80°C, generally no greater than 140°C, preferably no greater than 120°C and most preferably no greater than 100°C.
  • the present invention is a suitable anti-corrosion base coat for any curable second coating, in particular paint coatings.
  • Suitable coating layers are for examples acrylate resins, polyester resins, silicon modified polyester resins, polyvinyl chloride based mixed polymers and fluorocarbon resins, in particular polyvinylidene fluoride or paints containing these materials. Paint coatings are generally applied in two layers: a primer layer, followed by a topcoat.
  • Other suitable second coating materials are for example organic materials such as dispersions of resin powder in a plasticising medium, for example organosols such as polyvinylchloride plastisols. A primer coating may be applied prior to such a plastisol.
  • the second coating may comprise for example an adhesive which can be applied as a liquid to which a smooth or textured laminate based on polymeric substances such as softened PVC or polytetrafluoroethylene can be adhered. Curing of the second coating layer generally comprises drying and optionally this is with the aid of heat or radiation.
  • the second coating layer can be applied by any conventional method, for example for paint, generally by spraying, brushing or rolling.
  • An aqueous concentrate was formed by mixing 1.01/moles phosphoric acid with water and subsequently adding and mixing 0.27 moles of calcium hydroxide. Separately, 0.58 moles of boric acid was mixed with water. The two aqueous solutions were mixed together and 1.25 moles Aerosil 200 (trade mark) and deionised water were added to a total volume of 1000 ml. The solution was mixed in a Silverson (trade mark) mixer.
  • the resultant concentrate was a white acidic, viscous liquid.
  • a working solution was then prepared comprising 15% of this concentrate, the remaining 85% comprising deionised water.
  • the composition was applied to the surface of hot dip galvanised and electro galvanised metal plates. Prior to application of the coating composition, the metal plates had been treated by cleaning and demineralised rinsing. Application of the coating composition to the plates was by uniform wetting of the surface by Sheen spinner.
  • the sheen spinner is a simple horizontal rotating plate (usually up to 1000 r.p.m.).
  • the metal test plate was fastened to the rotating plate, brushed with the solution and rotated for a short time (usually 30 seconds to 1 min). In this way the liquid composition was evenly spread on the shole surface with consistent coating weight.
  • the coating was cured by oven drying at a temperature of 100°C for 1 minute.
  • the coating weights obtained were 0.15-0.3 g/m.
  • a paint coating was then directly applied over the resulting layer.
  • the paint coatings used were:
  • the coated, painted metal plates were then tested for corrosion and mechanical properties using the following tests:
  • Corrosion resistance was evaluated by salt spray tests. Steel and galvanised metal plates were tested according to ASTM B117 and aluminium using acetic salt spray tests, according to ASTM B287.
  • T-bend tests were carried out on the powder coated paint surfaces by bending each plate by 180°, so as to fold it back onto itself, tightly. This was followed by placing tape over each plate and evaluating the conversion coating/paint coating loss. For the paint coated plates according to b, T-bend stripline tests were carried out followed by taping and evaluation.
  • a two-pack concentrate composition was prepared: the first pack by mixing 1.31 moles phosphoric acid in water with 0.45 moles zinc carbonate followed by 0.16 moles hydrogen fluoride. The composition was made up to 1000 ml with deionised water. The second pack was prepared by adding de-ionised water to 1.25 moles or Aerosil 380 and mixing using a Silverson mixer. Water was added to a total volume of 1000 ml. The first pack formed a clear acidic solution and the second pack formed a white thixotropic neutral composition.
  • the two-pack concentrate was mixed and a working composition was prepared comprising 15% of each concentrate, the remaining 70% comprising deionised water.
  • the coating weights obtained were 0.15 to 0.3 g/m3.
  • Example 1 A selection of the tests set on in Example 1 were carried out on metal plate samples comprising cold rolled steel, aluminium, Galfan (trade mark) (95% zinc, 5% aluminium), Zalutite (trade mark) (45% zinc, 55% aluminium), hot dip galvanised and electrogalvanised metals.
  • An aqueous concentrate composition was prepared by dissolving 0.55 moles calcium hydroxide and 1.46 moles phosphoric acid in deionised water, 0.44 moles boric acid were added followed by 0.91 moles Aerosil 200 and deionised water to a total volume of 1000 ml, the composition being mixed in a Silverson mixer.
  • the resultant composition was a white acidic thixotropic liquid.
  • a working composition was prepared comprising 33% concentrate, the remainder being de-ionised water. The coating weights obtained were 0.6 to 0.8 g/m.
  • a chromium containing metal treatment concentrate was prepared comprising 1.05 moles (105 parts by weight chromic acid), 16 parts by weight wheat starch, 1.67 moles (100 parts by weight) Aeorsil 350 (trade mark), 0.05 moles (5.53 parts) zinc carbonate and deionised water to a total 1000 parts.
  • the pH of the composition was 3.0 and chromium VI:chromium III ratio was 0.55.
  • a working composition was prepared comprising 25% concentrate, the remainder comprising deionised water.
  • the coating weights obtained were 0.25 - 0.3 g/m on cold rolled steel metal plates, 0.3 to 0.35 g/m3 on galvanised plates and 0.4 to 0.45 g/m on aluminium metal plates. Comparative tests for corrosion and mechanical properties were carried out as described in Example 1 for cold rolled steel, hot dip galvanised, electro galvanised and aluminium metal substrates.
  • Compositions B and C were prepared in deionised water as set out in table 6 below.
  • Table 6 Component mole/l Solution B mole/l C mole/l Silica (Aerosil 200) 0.16 0.16 Phosphoric acid (100%) 0.81 0.81 Boric Acid 0.16 0.16 Zinc ions (added as ZnCO3) 0.078 0.08 Molybdic acid 0.06 -
  • compositions were each applied to cold rolled steel plates which had been brushed and cleaned with an alkali cleaner to a complete water-break free surface. Each composition was applied by the sheen spinner disc then stoved at 120°C p.m.t. (peak metal temperature). A black polyester powder coating was applied electrostatically and stoved at 210°C to a paint thickness of 50 ⁇ m.
  • Tests were carried out for corrosion (2 plates) and mechanical properties (1 plate) as described in example 1, using salt spray tests and mechanical tests A, B and C.

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
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  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)

Claims (17)

  1. Verfahren zur Beschichtung einer Metalloberfläche, umfassend in einer ersten Stufe die Kontaktierung der Metalloberfläche mit einer wäßrigen Zusammensetzung, die Siliciumdioxid, Phosphorsäure und ein aus Mangan-, Kobalt-, Eisen-, Zink- und Erdalkalimetallionen ausgewähltes zweiwertiges Metallion in einer Konzentration von mindestens 0,001 M umfaßt, wobei die Zusammensetzung im wesentlichen frei von Chrom und irgendwelchen Oxy-Metallanionen, in denen das Metall eine Wertigkeit von mindestens 5 aufweist, ist, und das anschließende Härten des beschichteten Metallsubstrats ohne zwischengeschaltete Spülstufe, und in einer zweiten Stufe das Aufbringen einer zweiten Überzugsschicht, die härtbar ist, um eine fixierte Schicht zu bilden.
  2. Verfahren nach Anspruch 1, in welchem die wäßrige Zusammensetzung im wesentlichen frei von dreiwertigen Metallionen ist.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, in welchem das zweiwertige Metallion aus Calcium, Magnesium und Zink ausgewählt ist.
  4. Verfahren nach irgendeinem der Ansprüche 1 bis 3, in welchem die Metalloberfläche für die Beschichtung überwiegend galvanisiertes Metall umfaßt und in der wäßrigen Zusammensetzung der Siliciumdioxid-Gehalt 0,01 bis 1,0 M beträgt, der Gesamt-Phosphat-Gehalt 0,02 bis 0,5 M, vorzugsweise 0,05 bis 0,2 M, noch bevorzugter mindestens 0,1 M, beträgt, der Gehalt an freier Phosphorsäure 0,02 bis 0,5 M, vorzugsweise 0,05 bis 0,25 M, beträgt und der Gehalt an zweiwertigem Metallion 0,01 bis 0,5 M (bezogen auf den Metallionen-Gehalt) beträgt.
  5. Verfahren nach Anspruch 3, in welchem das Molverhältnis Siliciumdioxid:Gesamt-Phosphationen 1:1 bis 1:0,7 beträgt, das Verhältnis Metallionen:Gesamt-Phosphationen 1:3 bis 1:5 beträgt und das Verhältnis Metallionen:Siliciumdioxid 1:2,5 bis 1:7 beträgt.
  6. Verfahren nach irgendeinem der Ansprüche 1 bis 3, in welchem die Metalloberfläche überwiegend Aluminium oder Zink/Aluminium-Legierung umfaßt und in der wäßrigen Zusammensetzung der Siliciumdioxid-Gehalt 0,01 bis 1,0 M beträgt, der Gesamt-Phosphationen-Gehalt 0,02 bis 2,0 M, vorzugsweise 0,2 bis 0,5 M, beträgt und der Gehalt an freier Phosphorsäure 0,02 bis 0,5 M, vorzugsweise 0,04 bis 0,2 M beträgt und der Metallionen-Gehalt 0,03 bis 0,5 M, vorzugsweise 0,05 bis 0,2 M, beträgt.
  7. Verfahren nach Anspruch 6, in welchem das Molverhältnis Siliciumdioxid:Gesamt-Phosphationen im Bereich von 1:0,8 bis 1:1,5 liegt; das Verhältnis zweiwertige Metallionen:Gesamt-Phosphationen im Bereich von 1:2,5 bis 1:5 liegt und das Verhältnis Metallionen:Siliciumdioxid im Bereich von 1:2,5 bis 1:3 liegt.
  8. Verfahren nach Anspruch 6 oder Anspruch 7, in welchem die Metalloberfläche überwiegend aus Aluminium besteht und die Zusammensetzung Fluoridionen, vorzugsweise in Mengen bis zu 0,5 M, einschließt.
  9. Verfahren nach irgendeinem der Ansprüche 1 bis 3, in welchem die Metalloberfläche überwiegend Stahl umfaßt und in der wäßrigen Zusammensetzung der Siliciumdioxid-Gehalt 0,05 bis 1,0 M beträgt, der Gehalt an Gesamt-Phosphationen 0,05 bis 2,0 M, vorzugsweise 0,1 bis 1,0, M beträgt, der Gehalt an freier Phosphorsäure 0,05 bis 0,5 M, vorzugsweise 0,1 bis 0,3 M, beträgt und der Metallionen-Gehalt 0,05 bis 1,0 M, vorzugsweise 0,1 bis 0,5 M, beträgt.
  10. Verfahren nach Anspruch 9, in welchem das Molverhältnis Siliciumdioxid:Gesamt-Phosphationen 1:1 bis 1:2 beträgt, das Verhältnis zweiwertige Metallionen:Phosphationen 1:2,5 bis 1:5 beträgt und das Verhältnis zweiwertige Metallionen:Siliciumdioxid 1:1 bis 1:3 beträgt.
  11. Verfahren nach irgendeinem vorangehenden Anspruch, in welchem die Zusammensetzung im wesentlichen frei von Nickelionen ist.
  12. Verfahren nach irgendeinem der Ansprüche 1 bis 5 oder 9 bis 11, in welchem die Metalloberfläche überwiegend galvanisiertes Metall und/oder Stahl umfaßt und die Zusammensetzung Borsäure, vorzugsweise in einer Menge von 0,02 bis 0,7 M, einschließt.
  13. Verfahren nach irgendeinem vorangehenden Anspruch, in welchem die Zusammensetzung durch Spulenbeschichtung aufgebracht wird und das Kontaktieren durch Eintauchen erfolgt.
  14. Verfahren nach Anspruch 13, in welchem die Härtungsstufe durch Durchleiten des beschichteten Metallgegenstandes durch einen Ofen bei 80 bis 100°C erfolgt.
  15. Verfahren nach Anspruch 13 oder Anspruch 14, in welchem die zweite Überzugsschicht unmittelbar nach der Härtung des ersten Überzugs aufgebracht wird.
  16. Verfahren nach Anspruch 2, in welchem die wäßrige Zusammensetzung in einem vorangehenden Schritt durch Verdünnen eines Konzentrats, das Siliciumdioxid, Phosphorsäure und ein zweiwertiges Metallion umfaßt, mit Wasser hergestellt wird, wobei das Konzentrat im wesentlichen frei von Chrom, irgendwelchen Oxy-Metallionen, in denen das Metall eine Wertigkeit von mindestens 5 aufweist, und jeglichen dreiwertigen Metallionen ist.
  17. Verfahren nach Anspruch 16, in welchem das Konzentrat zwei Packungen umfaßt und die erste Packung mindestens Fluorwasserstoff und die zweite Packung mindestens Siliciumdioxid umfaßt.
EP93302702A 1992-04-08 1993-04-06 Phosphatierungsbehandlung für metallische Substrate Expired - Lifetime EP0565346B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929207725A GB9207725D0 (en) 1992-04-08 1992-04-08 Phosphating solution for metal substrates
GB9207725 1992-04-08

Publications (2)

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EP0565346A1 EP0565346A1 (de) 1993-10-13
EP0565346B1 true EP0565346B1 (de) 1996-03-20

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EP (1) EP0565346B1 (de)
CA (1) CA2093612C (de)
DE (1) DE69301851T2 (de)
ES (1) ES2085112T3 (de)
GB (1) GB9207725D0 (de)

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DE4433946A1 (de) * 1994-09-23 1996-03-28 Henkel Kgaa Phosphatierverfahren ohne Nachspülung
DE4443882A1 (de) * 1994-12-09 1996-06-13 Metallgesellschaft Ag Verfahren zum Aufbringen von Phosphatüberzügen auf Metalloberflächen
US6066350A (en) * 1997-02-07 2000-05-23 Cargill Incorporated Method and arrangement for processing cocoa mass
US5968240A (en) * 1997-08-19 1999-10-19 Sermatech International Inc. Phosphate bonding composition
EP0916624B1 (de) * 1997-11-11 2001-07-25 Kawasaki Steel Corporation Porzellan-emailliertes Stahlblech und Fritten zur Emaillierung
FR2796655B1 (fr) * 1999-07-22 2001-10-19 Dacral Sa Procede et composition de traitement anti-corrosion d'un substrat metallique prealablement protege par une couche de revetement a base de zinc
DE10006270B4 (de) * 2000-02-12 2006-07-20 Bayerische Motoren Werke Ag Lackierverfahren und damit hergestelltes Metallbauteil
US8062435B2 (en) * 2001-06-18 2011-11-22 Henkel Kommanditgesellschaft Auf Aktien Phosphating operation
SE523949C2 (sv) * 2002-03-20 2004-06-08 Atlas Copco Secoroc Ab Förfarande vid korrosionsskydd av särskilt korrosionsutsatta delar i bergborrutrustning
US20040018309A1 (en) * 2002-07-25 2004-01-29 Carrier Corporation Furnace parts protected by thermally and chemically resistant coatings
US8900344B2 (en) 2010-03-22 2014-12-02 T3 Scientific Llc Hydrogen selective protective coating, coated article and method
SE535183C2 (sv) * 2010-09-09 2012-05-15 Atlas Copco Secoroc Ab Korrosionsskyddad nackadapter för en bergborrmaskin, förfarande samt bergborrmaskin innefattande korrosionsskyddad nackadepter
US9057397B2 (en) * 2010-09-22 2015-06-16 Mcgard Llc Chrome-plated fastener with organic coating

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DE69301851D1 (de) 1996-04-25
GB9207725D0 (en) 1992-05-27
EP0565346A1 (de) 1993-10-13
CA2093612A1 (en) 1993-10-09
ES2085112T3 (es) 1996-05-16
US5482746A (en) 1996-01-09
DE69301851T2 (de) 1996-08-01
CA2093612C (en) 2005-05-31

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